Ludlow Spacing Case/Drawer Layout

I am trying to get my Ludlow letter and word spacing material all organized, but the layout of the spacing case/drawer doesn’t make much sense to me. Do you know where I might find a layout for the Ludlow spacing cabinet? Any help would be greatly appreciated!

If you are referring to the spacing drawer that slides out from the side of the cabinet, mine has two identical rows for placement in order by size, widest at the left, thins at the right. There are two kinds of spacing matrix, one kind casts low at slug height, and the other casts high to fill the spaces up to shoulder height, and you want to keep these apart.